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【单选题】
变量数列的两个构成要素是( )
A.
一个是单位数 , 另一个是指标数
B.
一个是指标值 , 另一个是分配次数
C.
一个是分组 , 另一个是次数
D.
一个是总体总量 , 另一个是标志值
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Green bananas are very useful fruit.
B.
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